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36
37
38 import javax.help.*;
39 import java.util.*;
40 import java.net.*;
41 import javax.swing.*;
42 import java.awt.event.ActionEvent  ;
43 import javax.jnlp.DownloadService;
44 import javax.jnlp.DownloadServiceListener;
45 import javax.jnlp.ServiceManager;
46 import javax.jnlp.UnavailableServiceException;
47
48 public class HelpHandler {
49
50 static private DownloadService _ds = null;
51
52 static public final String helpsetName = "HolidayHistory.hs";
53
54 static public HelpBroker _hb = null;
55
56 static public void showHelp(final ActionEvent evt) {
57 new Thread () {
58 public void run() {
59 showHelpHelper(evt);
60 }
61 }.start();
62 }
63
64 static public void showHelpHelper(ActionEvent evt) {
65 checkForDownload();
66 initializeHelpSystem();
67 new CSH.DisplayHelpFromSource(_hb).actionPerformed(evt);
68 }
69
70 static public synchronized void initializeHelpSystem() {
71 if (_hb != null) return;
72 try {
73 JOptionPane pane = new JOptionPane("Initializing help system. Please Wait...",
74 JOptionPane.INFORMATION_MESSAGE);
75 JDialog dialog = pane.createDialog(null, "WebPad Help System");
76 dialog.setModal(false);
77 dialog.setVisible(true);
78
79 HelpSet hs = null;
80 ClassLoader cl = HelpHandler.class.getClassLoader();
81 URL hsURL = HelpSet.findHelpSet(cl, helpsetName);
82 hs = new HelpSet(cl, hsURL);
83 _hb = hs.createHelpBroker();
84 _hb.initPresentation();
85 dialog.setVisible(false);
86 } catch (Exception ee) {
87 System.out.println("HelpSet " + helpsetName + " not found");
88 return;
89 }
90 }
91
92 static private void checkForDownload() {
93 try {
94 _ds = (DownloadService)ServiceManager.lookup("javax.jnlp.DownloadService");
95 } catch (UnavailableServiceException e) {
96 _ds = null;
97
98 }
99
100 if (_ds != null) {
101 try {
102
103 if (_ds.isPartCached("help")) {
104 System.out.println("Help System is cached");
105 return;
106 }
107 _ds.loadPart("help", _ds.getDefaultProgressWindow());
108 } catch(Exception e) {
109 e.printStackTrace();
110 }
111 }
112 }
113 }
114
115 |
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